GE, 4 Pin, Non Integrated Compact Fluorescent Bulbs, 28 W, 3500K, Warm White

Compact Fluorescent Lamps

Energy saving of typically 75-80% when compared to GLS lamps of a comparable light output
Long life, 10000 hours typically, which equates to lower maintenance costs
2-pin versions have integral starters and should only be used with switch start ballasts
4-pin versions are designed primarily for use with high frequency ballasts or in emergency lighting applications
Triphosphor coatings give good colour rendition: Ra 80 to 89
Choice of colour temperatures

Please note that some types of lamps are inter-changeable, as long
as lamps of similar characteristics are used. These are:

Philips PL-L and GE Biax L
Philips PL-S (2pin), Osram Dulux S and GE Biax S
Philips PL-S (4pin), Osram Dulux S (4pin) and GE Biax S/E
Philips PL-C (2pin), Osram Dulux D and GE Biax D
Philips PL-C (4pin), Osram Dulux D (4pin) and GE Biax D/E